Electromagnetic interference isolator

H - Electricity – 04 – B

Patent

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H04B 3/00 (2006.01) H04B 15/00 (2006.01) H04L 25/08 (2006.01)

Patent

CA 2196601

A termination is provided for a differential transmission line such as unshielded twisted pair (UTP) to isolate a connected device from electromagnetic interference present on the UTP in the form of differential mode and common mode noise. An example of an electromagnetic interference isolator comprises a common mode and a differential mode termination (24, 25), a common mode choke (26) which exhibits substantially constant impedance over a wide bandwidth and a centre tapped isolation transformer (27).

Terminaison destinée à une ligne de transmission différentielle telle qu'une paire torsadée non blindée (UTP) afin d'isoler un dispositif connecté de l'interférence électromagnétique présente sur ladite paire torsadée, sous forme de bruit en mode différentiel et en mode commun. Un exemple d'isolateur d'interférence électromagnétique comprend une terminaison (24, 25) en mode commun et en mode différentiel, une bobine d'arrêt (26) en mode commun possédant une impédance sensiblement constante sur une grande largeur de bande, ainsi qu'un transformateur (27) d'isolement à prises médianes.

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